Remove beforeload events.

Source/core/html/HTMLTrackElement.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 189 matching lines @@
     // mode being the state of the media element's crossorigin content attribute, the origin being the
     // origin of the media element's Document, and the default origin behaviour set to fail.
     if (url.isEmpty())
         return false;
 
     if (!document().contentSecurityPolicy()->allowMediaFromSource(url)) {
         WTF_LOG(Media, "HTMLTrackElement::canLoadUrl(%s) -> rejected by Content Security Policy", urlForLoggingTrack(url).utf8().data());
         return false;
     }
 
-    return dispatchBeforeLoadEvent(url.string());
+    return true;
 }
 
 void HTMLTrackElement::didCompleteLoad(LoadStatus status)
 {
     // 4.8.10.12.3 Sourcing out-of-band text tracks (continued)
 
     // 4. Download: ...
     // If the fetching algorithm fails for any reason (network error, the server returns an error
     // code, a cross-origin check fails, etc), or if URL is the empty string or has the wrong origin
     // as determined by the condition at the start of this step, or if the fetched resource is not in
@@ skipping 45 matching lines @@
 
 HTMLMediaElement* HTMLTrackElement::mediaElement() const
 {
     Element* parent = parentElement();
     if (isHTMLMediaElement(parent))
         return toHTMLMediaElement(parent);
     return 0;
 }
 
 }